Re: [AFMUG] optical TX power levels

[Ken Hohhof]

Consider my socks blown off.Do you need 2 of them, one for each strand? Does it 
go at the xmt end, or the rcv end, or doesn't matter? I'm assuming you don't 
need 4 total. Original Message From: "Daniel Pautz via AF" Sent: 
1/24/2024 5:00:29 PMTo: "AnimalFarm Microwave Users Group" Cc: "Daniel Pautz" 
Subject: Re: [AFMUG] optical TX power levels







Dispersion compensation module -
https://www.fs.com/products/65783.html
?


From: AF 
On Behalf Of Ken Hohhof
Sent: Wednesday, January 24, 2024 3:53 PM
To: 'AnimalFarm Microwave Users Group' 
Subject: Re: [AFMUG] optical TX power levels


?
I spent a few minutes searching on the term DCM and came up with ?chirped fiber 
Bragg grating?.
https://en.wikipedia.org/wiki/Fiber_Bragg_grating
?
OK, I?m out of my depth now.
?
?


From: AF 
On Behalf Of Daniel Pautz via AF
Sent: Wednesday, January 24, 2024 4:40 PM
To: AnimalFarm Microwave Users Group 
Cc: Daniel Pautz 
Subject: Re: [AFMUG] optical TX power levels


?
Perhaps pick up a used cheap DCM and see if it helps,? adjustable? preferred if 
not as close to the fiber distance.?? Our newest 100G dwdm build (dozen 100G 
optics) very much
 needed a DCM on it.?? 
?


From: AF 
On Behalf Of Chuck McCown via AF
Sent: Wednesday, January 24, 2024 3:36 PM
To: 'AnimalFarm Microwave Users Group' 
Cc: ch...@go-mtc.com
Subject: Re: [AFMUG] optical TX power levels


?



Gotta think of the Fourier series of the pulse.? Yes group velocities or group 
delay of the whole enchalada.? It is all kinda the same thing.? They were doing 
some kind of soliton
 fiber development.? Haven?t heard much for some time about that.? No idea how 
frequency pure/coherent the tx is.? I imagine phase coherency is a big deal.



?


?




?



From: Ken Hohhof



Sent: Wednesday, January 24, 2024 4:12 PM


To: 'AnimalFarm Microwave Users Group'



Subject: Re: [AFMUG] optical TX power levels




?



Looks like different wavelengths have different group velocities, so 
compensation is possible (but probably not cheap?).
?
Is this because the transmitter doesn?t generate literally a single 
wavelength?? Or is this a WDM issue?? Chuck says the pulses get smeared out in 
time, that sounds like the first one.
?


From: AF 
On Behalf Of Chuck McCown via AF
Sent: Wednesday, January 24, 2024 3:56 PM
To: AnimalFarm Microwave Users Group 
Cc: ch...@go-mtc.com
Subject: Re: [AFMUG] optical TX power levels


?



Yeah, the pulses tend to get smeared out in time if there is too much 
dispersion.? Similar to trying to use too high level of QAM with SNR issues.?



?



From: Josh Luthman





Sent: Wednesday, January 24, 2024 12:26 PM


To: AnimalFarm Microwave Users Group



Subject: Re: [AFMUG] optical TX power levels




?




Even if the RX level is good?

> rx was within 0.3dBm on all 4 lanes on both sides


?



On Wed, Jan 24, 2024 at 1:22?PM Daniel Pautz via AF  wrote:





Yeah makes me think the two paths have different loss.?? We have had that on 
mirrored paths,? or even single paths with
 crappy splices on one of the strands.? 
?


From: AF 
On Behalf Of Chuck McCown via AF
Sent: Wednesday, January 24, 2024 11:12 AM
To: AnimalFarm Microwave Users Group 
Cc: ch...@go-mtc.com
Subject: Re: [AFMUG] optical TX power levels


?



Did anyone do dispersion testing on the fiber?


?


Chuck McCown
McCown Technology Corporation
8401 N Commerce Dr
Lake Point, Utah 84074
801-250-9503
435-830-4306 cell 
www.mccowntech.com
www.microtrench-blades.com
www.terabitnetworks.com




?




From: Zach Underwood




Sent: Wednesday, January 24, 2024 12:07 PM



To: AnimalFarm Microwave Users Group




Subject: Re: [AFMUG] optical TX power levels




?




tired again this morning and still no link. rx was within 0.3dBm on all 4 lanes 
on both sides. We got 10gb 80km to link
 up. This will do for now. We will be looking at getting 40gb 80km single lane 
optics or adding another site to fiber loop to shorten the footage to under 
40km.



?



On Wed, Jan 24, 2024 at 11:14?AM Colin Stanners  wrote:




So both of those SFPs are within the tx power range.



?


100G may not work on a link that long unless you have dispersion compensation 
fiber on the path or in a huge loop in a
 box style at one end. 

?


You likely cannot change tx power levels on those SFPs, they will run at the 
max they can do for that specific unit.

?


On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood  wrote:





TX Power??
2~6.5dBm


?


I am struggling to get this 100gb link up. In the field this link is quoted at 
31 miles. The rx levels
 are -22 and -20 on both sides but I can't get it to link. I take the same 
optics to the lab and add 20dbm of
attenuator to get almost the same rx levels as the field and it will link up.


I have added error-correction encoding reed-solomon per the user guide for 
links over 40km.

So far I have not found a way to change the TX levels in arista, the options 
are in the CLI but they dont seem to change the outcome. For me this is the 
first time dealing 

Re: [AFMUG] optical TX power levels

[Zach Underwood]

Ok we got the report back from the fiber supplier. This is new to me so
anyone can offer insight into it?

PDF
https://drive.google.com/file/d/1KeIuWHFsiKZHxcmpPiY8PX_-PABl55Sz/view?usp=sharing


On Wed, Jan 24, 2024 at 6:00 PM Daniel Pautz via AF  wrote:

> Dispersion compensation module - https://www.fs.com/products/65783.html
>
>
>
> *From:* AF  *On Behalf Of *Ken Hohhof
> *Sent:* Wednesday, January 24, 2024 3:53 PM
> *To:* 'AnimalFarm Microwave Users Group' 
> *Subject:* Re: [AFMUG] optical TX power levels
>
>
>
> I spent a few minutes searching on the term DCM and came up with “chirped
> fiber Bragg grating”.
>
> https://en.wikipedia.org/wiki/Fiber_Bragg_grating
>
>
>
> OK, I’m out of my depth now.
>
>
>
>
>
> *From:* AF  *On Behalf Of *Daniel Pautz via AF
> *Sent:* Wednesday, January 24, 2024 4:40 PM
> *To:* AnimalFarm Microwave Users Group 
> *Cc:* Daniel Pautz 
> *Subject:* Re: [AFMUG] optical TX power levels
>
>
>
> Perhaps pick up a used cheap DCM and see if it helps,  adjustable
> preferred if not as close to the fiber distance.   Our newest 100G dwdm
> build (dozen 100G optics) very much needed a DCM on it.
>
>
>
> *From:* AF  *On Behalf Of *Chuck McCown via AF
> *Sent:* Wednesday, January 24, 2024 3:36 PM
> *To:* 'AnimalFarm Microwave Users Group' 
> *Cc:* ch...@go-mtc.com
> *Subject:* Re: [AFMUG] optical TX power levels
>
>
>
> Gotta think of the Fourier series of the pulse.  Yes group velocities or
> group delay of the whole enchalada.  It is all kinda the same thing.  They
> were doing some kind of soliton fiber development.  Haven’t heard much for
> some time about that.  No idea how frequency pure/coherent the tx is.  I
> imagine phase coherency is a big deal.
>
>
>
>
>
>
>
> *From:* Ken Hohhof
>
> *Sent:* Wednesday, January 24, 2024 4:12 PM
>
> *To:* 'AnimalFarm Microwave Users Group'
>
> *Subject:* Re: [AFMUG] optical TX power levels
>
>
>
> Looks like different wavelengths have different group velocities, so
> compensation is possible (but probably not cheap?).
>
>
>
> Is this because the transmitter doesn’t generate literally a single
> wavelength?  Or is this a WDM issue?  Chuck says the pulses get smeared out
> in time, that sounds like the first one.
>
>
>
> *From:* AF  *On Behalf Of *Chuck McCown via AF
> *Sent:* Wednesday, January 24, 2024 3:56 PM
> *To:* AnimalFarm Microwave Users Group 
> *Cc:* ch...@go-mtc.com
> *Subject:* Re: [AFMUG] optical TX power levels
>
>
>
> Yeah, the pulses tend to get smeared out in time if there is too much
> dispersion.  Similar to trying to use too high level of QAM with SNR
> issues.
>
>
>
> *From:* Josh Luthman
>
> *Sent:* Wednesday, January 24, 2024 12:26 PM
>
> *To:* AnimalFarm Microwave Users Group
>
> *Subject:* Re: [AFMUG] optical TX power levels
>
>
>
> Even if the RX level is good?
>
> > rx was within 0.3dBm on all 4 lanes on both sides
>
>
>
> On Wed, Jan 24, 2024 at 1:22 PM Daniel Pautz via AF 
> wrote:
>
> Yeah makes me think the two paths have different loss.   We have had that
> on mirrored paths,  or even single paths with crappy splices on one of the
> strands.
>
>
>
> *From:* AF  *On Behalf Of *Chuck McCown via AF
> *Sent:* Wednesday, January 24, 2024 11:12 AM
> *To:* AnimalFarm Microwave Users Group 
> *Cc:* ch...@go-mtc.com
> *Subject:* Re: [AFMUG] optical TX power levels
>
>
>
> Did anyone do dispersion testing on the fiber?
>
>
>
> Chuck McCown
> McCown Technology Corporation
> 8401 N Commerce Dr
> Lake Point, Utah 84074
> 801-250-9503
> 435-830-4306 cell
> www.mccowntech.com
> www.microtrench-blades.com
> www.terabitnetworks.com
>
>
>
> *From:* Zach Underwood
>
> *Sent:* Wednesday, January 24, 2024 12:07 PM
>
> *To:* AnimalFarm Microwave Users Group
>
> *Subject:* Re: [AFMUG] optical TX power levels
>
>
>
> tired again this morning and still no link. rx was within 0.3dBm on all 4
> lanes on both sides. We got 10gb 80km to link up. This will do for now. We
> will be looking at getting 40gb 80km single lane optics or adding another
> site to fiber loop to shorten the footage to under 40km.
>
>
>
> On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners 
> wrote:
>
> So both of those SFPs are within the tx power range.
>
>
>
> 100G may not work on a link that long unless you have dispersion
> compensation fiber on the path or in a huge loop in a box style at one end.
>
>
>
> You likely cannot change tx power levels on those SFPs, they will run at
> the max they can do for that specific unit.
>
>
>
> On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood 
> wrote:
>
>
> *TX Power*   2~6.5dBm
>
>
>
> I am struggling to get this 100gb link up. In the field this link is
> quoted at 31 miles. The rx levels are -22 and -20 on both sides but I can't
> get it to link. I take the same optics to the lab and add 20dbm of attenuator
> to get almost the same rx levels as the field and it will link up.
>
> I have added error-correction encoding reed-solomon per the user guide for
> links over 40km.
>
> So far I have not found a way to change the TX levels in

Re: [AFMUG] optical TX power levels

[Mike Hammett]

Isn't 100G tolerant of dispersion, or is not all 100G coherent? 




- 
Mike Hammett 
Intelligent Computing Solutions 

Midwest Internet Exchange 

The Brothers WISP 




- Original Message -

From: "Colin Stanners"  
To: "AnimalFarm Microwave Users Group"  
Sent: Wednesday, January 24, 2024 10:13:25 AM 
Subject: Re: [AFMUG] optical TX power levels 



So both of those SFPs are within the tx power range. 


100G may not work on a link that long unless you have dispersion compensation 
fiber on the path or in a huge loop in a box style at one end. 


You likely cannot change tx power levels on those SFPs, they will run at the 
max they can do for that specific unit. 



On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood < zunder1...@gmail.com > wrote: 





TX Power 2~6.5dBm 



I am struggling to get this 100gb link up. In the field this link is quoted at 
31 miles. The rx levels are -22 and -20 on both sides but I can't get it to 
link. I take the same optics to the lab and add 20dbm of attenuator to get 
almost the same rx levels as the field and it will link up. 

I have added error-correction encoding reed-solomon per the user guide for 
links over 40km. 

So far I have not found a way to change the TX levels in arista, the options 
are in the CLI but they dont seem to change the outcome. For me this is the 
first time dealing with 80km optics or 100gb optics over 10km. 

switch is Arista DCS-7060SX2-48YC6-R 

https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf 
https://www.fs.com/products/115818.html?attribute=29032&id=3462585 



On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners < cstann...@gmail.com > wrote: 



There should be. What does their datasheey indicate for tx power range? 


On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood < zunder1...@gmail.com > wrote: 



Yep labels identical but there is a difference in default power levels. 


On Wed, Jan 24, 2024, 8:13 AM Mike Hammett < af...@ics-il.net > wrote: 




Oh, meaning the variance between the two, otherwise identical models? 




- 
Mike Hammett 
Intelligent Computing Solutions 

Midwest Internet Exchange 

The Brothers WISP 






From: "Zach Underwood" < zunder1...@gmail.com > 
To: "AnimalFarm Microwave Users Group" < af@af.afmug.com > 
Sent: Tuesday, January 23, 2024 12:51:39 PM 
Subject: [AFMUG] optical TX power levels 


I got 2x 100gb 80km optics from FS that run difficult default TX power levels 
one is 3.81dBm and the other 2.63dBm, the config on the arista devices hosting 
the optics is the same. 


Has anyone seen much difference between optic like this? My sample size is 
small due to the optices costing $4k each 



-- 






Zach Underwood (RHCE,RHCSA,RHCT, UACA ) 


My website 

advance-networking.com 

-- 
AF mailing list 
AF@af.afmug.com 
http://af.afmug.com/mailman/listinfo/af_af.afmug.com 

-- 
AF mailing list 
AF@af.afmug.com 
http://af.afmug.com/mailman/listinfo/af_af.afmug.com 


-- 
AF mailing list 
AF@af.afmug.com 
http://af.afmug.com/mailman/listinfo/af_af.afmug.com 


-- 
AF mailing list 
AF@af.afmug.com 
http://af.afmug.com/mailman/listinfo/af_af.afmug.com 





-- 






Zach Underwood (RHCE,RHCSA,RHCT, UACA ) 


My website 

advance-networking.com 
-- 
AF mailing list 
AF@af.afmug.com 
http://af.afmug.com/mailman/listinfo/af_af.afmug.com 



-- 
AF mailing list 
AF@af.afmug.com 
http://af.afmug.com/mailman/listinfo/af_af.afmug.com 

-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com

Re: [AFMUG] optical TX power levels

[Adam Moffett]

I wonder if it would work as 4x 25gig links.  Should be able to configure it 
that way.

Get Outlook for iOS

From: AF  on behalf of Chuck McCown via AF 

Sent: Wednesday, January 24, 2024 5:36:06 PM
To: 'AnimalFarm Microwave Users Group' 
Cc: ch...@go-mtc.com 
Subject: Re: [AFMUG] optical TX power levels

Gotta think of the Fourier series of the pulse.  Yes group velocities or group 
delay of the whole enchalada.  It is all kinda the same thing.  They were doing 
some kind of soliton fiber development.  Haven’t heard much for some time about 
that.  No idea how frequency pure/coherent the tx is.  I imagine phase 
coherency is a big deal.



From: Ken Hohhof
Sent: Wednesday, January 24, 2024 4:12 PM
To: 'AnimalFarm Microwave Users Group'
Subject: Re: [AFMUG] optical TX power levels


Looks like different wavelengths have different group velocities, so 
compensation is possible (but probably not cheap?).



Is this because the transmitter doesn’t generate literally a single wavelength? 
 Or is this a WDM issue?  Chuck says the pulses get smeared out in time, that 
sounds like the first one.



From: AF  On Behalf Of Chuck McCown via AF
Sent: Wednesday, January 24, 2024 3:56 PM
To: AnimalFarm Microwave Users Group 
Cc: ch...@go-mtc.com
Subject: Re: [AFMUG] optical TX power levels



Yeah, the pulses tend to get smeared out in time if there is too much 
dispersion.  Similar to trying to use too high level of QAM with SNR issues.



From: Josh Luthman

Sent: Wednesday, January 24, 2024 12:26 PM

To: AnimalFarm Microwave Users Group

Subject: Re: [AFMUG] optical TX power levels



Even if the RX level is good?

> rx was within 0.3dBm on all 4 lanes on both sides



On Wed, Jan 24, 2024 at 1:22 PM Daniel Pautz via AF  wrote:

Yeah makes me think the two paths have different loss.   We have had that on 
mirrored paths,  or even single paths with crappy splices on one of the strands.



From: AF  On Behalf Of Chuck McCown via AF
Sent: Wednesday, January 24, 2024 11:12 AM
To: AnimalFarm Microwave Users Group 
Cc: ch...@go-mtc.com
Subject: Re: [AFMUG] optical TX power levels



Did anyone do dispersion testing on the fiber?



Chuck McCown
McCown Technology Corporation
8401 N Commerce Dr
Lake Point, Utah 84074
801-250-9503
435-830-4306 cell
www.mccowntech.com
www.microtrench-blades.com
www.terabitnetworks.com



From: Zach Underwood

Sent: Wednesday, January 24, 2024 12:07 PM

To: AnimalFarm Microwave Users Group

Subject: Re: [AFMUG] optical TX power levels



tired again this morning and still no link. rx was within 0.3dBm on all 4 lanes 
on both sides. We got 10gb 80km to link up. This will do for now. We will be 
looking at getting 40gb 80km single lane optics or adding another site to fiber 
loop to shorten the footage to under 40km.



On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners  wrote:

So both of those SFPs are within the tx power range.



100G may not work on a link that long unless you have dispersion compensation 
fiber on the path or in a huge loop in a box style at one end.



You likely cannot change tx power levels on those SFPs, they will run at the 
max they can do for that specific unit.



On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood  wrote:

TX Power   2~6.5dBm



I am struggling to get this 100gb link up. In the field this link is quoted at 
31 miles. The rx levels are -22 and -20 on both sides but I can't get it to 
link. I take the same optics to the lab and add 20dbm of attenuator to get 
almost the same rx levels as the field and it will link up.

I have added error-correction encoding reed-solomon per the user guide for 
links over 40km.

So far I have not found a way to change the TX levels in arista, the options 
are in the CLI but they dont seem to change the outcome. For me this is the 
first time dealing with 80km optics or 100gb optics over 10km.

switch is Arista DCS-7060SX2-48YC6-R



https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
https://www.fs.com/products/115818.html?attribute=29032&id=3462585



On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners  wrote:

There should be. What does their datasheey indicate for tx power range?



On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood  wrote:

Yep labels identical but there is a difference in default power levels.



On Wed, Jan 24, 2024, 8:13 AM Mike Hammett  wrote:

Oh, meaning the variance between the two, otherwise identical models?


-
Mike Hammett
Intelligent Computing Solutions

Midwest Internet Exchange

The Brothers WISP







From: "Zach Underwood" 
To: "AnimalFarm Microwave Users Group" 
Sent: Tuesday, January 23, 2024 12:51:39 PM
Subject: [AFMUG] optical TX power levels

I got 2x 100gb 80km optics from FS that run difficult default TX power levels 
one is 3.81dBm and the other

Re: [AFMUG] optical TX power levels

[Daniel Pautz via AF]

Dispersion compensation module - https://www.fs.com/products/65783.html

From: AF  On Behalf Of Ken Hohhof
Sent: Wednesday, January 24, 2024 3:53 PM
To: 'AnimalFarm Microwave Users Group' 
Subject: Re: [AFMUG] optical TX power levels

I spent a few minutes searching on the term DCM and came up with “chirped fiber 
Bragg grating”.
https://en.wikipedia.org/wiki/Fiber_Bragg_grating

OK, I’m out of my depth now.


From: AF mailto:af-boun...@af.afmug.com>> On Behalf Of 
Daniel Pautz via AF
Sent: Wednesday, January 24, 2024 4:40 PM
To: AnimalFarm Microwave Users Group mailto:af@af.afmug.com>>
Cc: Daniel Pautz mailto:d...@webnx.com>>
Subject: Re: [AFMUG] optical TX power levels

Perhaps pick up a used cheap DCM and see if it helps,  adjustable  preferred if 
not as close to the fiber distance.   Our newest 100G dwdm build (dozen 100G 
optics) very much needed a DCM on it.

From: AF mailto:af-boun...@af.afmug.com>> On Behalf Of 
Chuck McCown via AF
Sent: Wednesday, January 24, 2024 3:36 PM
To: 'AnimalFarm Microwave Users Group' mailto:af@af.afmug.com>>
Cc: ch...@go-mtc.com
Subject: Re: [AFMUG] optical TX power levels

Gotta think of the Fourier series of the pulse.  Yes group velocities or group 
delay of the whole enchalada.  It is all kinda the same thing.  They were doing 
some kind of soliton fiber development.  Haven’t heard much for some time about 
that.  No idea how frequency pure/coherent the tx is.  I imagine phase 
coherency is a big deal.



From: Ken Hohhof
Sent: Wednesday, January 24, 2024 4:12 PM
To: 'AnimalFarm Microwave Users Group'
Subject: Re: [AFMUG] optical TX power levels

Looks like different wavelengths have different group velocities, so 
compensation is possible (but probably not cheap?).

Is this because the transmitter doesn’t generate literally a single wavelength? 
 Or is this a WDM issue?  Chuck says the pulses get smeared out in time, that 
sounds like the first one.

From: AF mailto:af-boun...@af.afmug.com>> On Behalf Of 
Chuck McCown via AF
Sent: Wednesday, January 24, 2024 3:56 PM
To: AnimalFarm Microwave Users Group mailto:af@af.afmug.com>>
Cc: ch...@go-mtc.com
Subject: Re: [AFMUG] optical TX power levels

Yeah, the pulses tend to get smeared out in time if there is too much 
dispersion.  Similar to trying to use too high level of QAM with SNR issues.

From: Josh Luthman
Sent: Wednesday, January 24, 2024 12:26 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] optical TX power levels

Even if the RX level is good?

> rx was within 0.3dBm on all 4 lanes on both sides

On Wed, Jan 24, 2024 at 1:22 PM Daniel Pautz via AF 
mailto:af@af.afmug.com>> wrote:
Yeah makes me think the two paths have different loss.   We have had that on 
mirrored paths,  or even single paths with crappy splices on one of the strands.

From: AF mailto:af-boun...@af.afmug.com>> On Behalf Of 
Chuck McCown via AF
Sent: Wednesday, January 24, 2024 11:12 AM
To: AnimalFarm Microwave Users Group mailto:af@af.afmug.com>>
Cc: ch...@go-mtc.com
Subject: Re: [AFMUG] optical TX power levels

Did anyone do dispersion testing on the fiber?

Chuck McCown
McCown Technology Corporation
8401 N Commerce Dr
Lake Point, Utah 84074
801-250-9503
435-830-4306 cell
www.mccowntech.com
www.microtrench-blades.com
www.terabitnetworks.com

From: Zach Underwood
Sent: Wednesday, January 24, 2024 12:07 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] optical TX power levels

tired again this morning and still no link. rx was within 0.3dBm on all 4 lanes 
on both sides. We got 10gb 80km to link up. This will do for now. We will be 
looking at getting 40gb 80km single lane optics or adding another site to fiber 
loop to shorten the footage to under 40km.

On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners 
mailto:cstann...@gmail.com>> wrote:
So both of those SFPs are within the tx power range.

100G may not work on a link that long unless you have dispersion compensation 
fiber on the path or in a huge loop in a box style at one end.

You likely cannot change tx power levels on those SFPs, they will run at the 
max they can do for that specific unit.

On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood 
mailto:zunder1...@gmail.com>> wrote:

TX Power   2~6.5dBm

I am struggling to get this 100gb link up. In the field this link is quoted at 
31 miles. The rx levels are -22 and -20 on both sides but I can't get it to 
link. I take the same optics to the lab and add 20dbm of attenuator to get 
almost the same rx levels as the field and it will link up.

I have added error-correction encoding reed-solomon per the user guide for 
links over 40km.

So far I have not found a way to change the TX levels in arista, the options 
are in the CLI but they dont seem to change the outcome. For me this is the 
first time dealing with 80km optics or 100gb optics over 10km.

switch

Re: [AFMUG] optical TX power levels

[Ken Hohhof]

I spent a few minutes searching on the term DCM and came up with “chirped fiber 
Bragg grating”.

https://en.wikipedia.org/wiki/Fiber_Bragg_grating

 

OK, I’m out of my depth now.

 

 

From: AF  On Behalf Of Daniel Pautz via AF
Sent: Wednesday, January 24, 2024 4:40 PM
To: AnimalFarm Microwave Users Group 
Cc: Daniel Pautz 
Subject: Re: [AFMUG] optical TX power levels

 

Perhaps pick up a used cheap DCM and see if it helps,  adjustable  preferred if 
not as close to the fiber distance.   Our newest 100G dwdm build (dozen 100G 
optics) very much needed a DCM on it.   

 

From: AF mailto:af-boun...@af.afmug.com> > On Behalf 
Of Chuck McCown via AF
Sent: Wednesday, January 24, 2024 3:36 PM
To: 'AnimalFarm Microwave Users Group' mailto:af@af.afmug.com> >
Cc: ch...@go-mtc.com  
Subject: Re: [AFMUG] optical TX power levels

 

Gotta think of the Fourier series of the pulse.  Yes group velocities or group 
delay of the whole enchalada.  It is all kinda the same thing.  They were doing 
some kind of soliton fiber development.  Haven’t heard much for some time about 
that.  No idea how frequency pure/coherent the tx is.  I imagine phase 
coherency is a big deal. 

 

 

 

From: Ken Hohhof 

Sent: Wednesday, January 24, 2024 4:12 PM

To: 'AnimalFarm Microwave Users Group' 

Subject: Re: [AFMUG] optical TX power levels

 

Looks like different wavelengths have different group velocities, so 
compensation is possible (but probably not cheap?).

 

Is this because the transmitter doesn’t generate literally a single wavelength? 
 Or is this a WDM issue?  Chuck says the pulses get smeared out in time, that 
sounds like the first one.

 

From: AF mailto:af-boun...@af.afmug.com> > On Behalf 
Of Chuck McCown via AF
Sent: Wednesday, January 24, 2024 3:56 PM
To: AnimalFarm Microwave Users Group mailto:af@af.afmug.com> >
Cc: ch...@go-mtc.com  
Subject: Re: [AFMUG] optical TX power levels

 

Yeah, the pulses tend to get smeared out in time if there is too much 
dispersion.  Similar to trying to use too high level of QAM with SNR issues.  

 

From: Josh Luthman 

Sent: Wednesday, January 24, 2024 12:26 PM

To: AnimalFarm Microwave Users Group 

Subject: Re: [AFMUG] optical TX power levels

 

Even if the RX level is good?

> rx was within 0.3dBm on all 4 lanes on both sides

 

On Wed, Jan 24, 2024 at 1:22 PM Daniel Pautz via AF mailto:af@af.afmug.com> > wrote:

Yeah makes me think the two paths have different loss.   We have had that on 
mirrored paths,  or even single paths with crappy splices on one of the 
strands.  

 

From: AF mailto:af-boun...@af.afmug.com> > On Behalf 
Of Chuck McCown via AF
Sent: Wednesday, January 24, 2024 11:12 AM
To: AnimalFarm Microwave Users Group mailto:af@af.afmug.com> >
Cc: ch...@go-mtc.com  
Subject: Re: [AFMUG] optical TX power levels

 

Did anyone do dispersion testing on the fiber?

 

Chuck McCown
McCown Technology Corporation
8401 N Commerce Dr
Lake Point, Utah 84074
801-250-9503
435-830-4306 cell 
www.mccowntech.com  
www.microtrench-blades.com  
www.terabitnetworks.com  

 

From: Zach Underwood 

Sent: Wednesday, January 24, 2024 12:07 PM

To: AnimalFarm Microwave Users Group 

Subject: Re: [AFMUG] optical TX power levels

 

tired again this morning and still no link. rx was within 0.3dBm on all 4 lanes 
on both sides. We got 10gb 80km to link up. This will do for now. We will be 
looking at getting 40gb 80km single lane optics or adding another site to fiber 
loop to shorten the footage to under 40km. 

 

On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners mailto:cstann...@gmail.com> > wrote:

So both of those SFPs are within the tx power range. 

 

100G may not work on a link that long unless you have dispersion compensation 
fiber on the path or in a huge loop in a box style at one end. 

 

You likely cannot change tx power levels on those SFPs, they will run at the 
max they can do for that specific unit.

 

On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood mailto:zunder1...@gmail.com> > wrote:


TX Power   2~6.5dBm

 

I am struggling to get this 100gb link up. In the field this link is quoted at 
31 miles. The rx levels are -22 and -20 on both sides but I can't get it to 
link. I take the same optics to the lab and add 20dbm of attenuator to get 
almost the same rx levels as the field and it will link up. 

I have added error-correction encoding reed-solomon per the user guide for 
links over 40km.

So far I have not found a way to change the TX levels in arista, the options 
are in the CLI but they dont seem to change the outcome. For me this is the 
first time dealing with 80km optics or 100gb optics over 10km. 

switch is Arista DCS-7060SX2-48YC6-R

 

https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
https://www.fs.com/products/115818.html?attribute=29032 

Re: [AFMUG] optical TX power levels

[Daniel Pautz via AF]

Perhaps pick up a used cheap DCM and see if it helps,  adjustable  preferred if 
not as close to the fiber distance.   Our newest 100G dwdm build (dozen 100G 
optics) very much needed a DCM on it.

From: AF  On Behalf Of Chuck McCown via AF
Sent: Wednesday, January 24, 2024 3:36 PM
To: 'AnimalFarm Microwave Users Group' 
Cc: ch...@go-mtc.com
Subject: Re: [AFMUG] optical TX power levels

Gotta think of the Fourier series of the pulse.  Yes group velocities or group 
delay of the whole enchalada.  It is all kinda the same thing.  They were doing 
some kind of soliton fiber development.  Haven’t heard much for some time about 
that.  No idea how frequency pure/coherent the tx is.  I imagine phase 
coherency is a big deal.



From: Ken Hohhof
Sent: Wednesday, January 24, 2024 4:12 PM
To: 'AnimalFarm Microwave Users Group'
Subject: Re: [AFMUG] optical TX power levels

Looks like different wavelengths have different group velocities, so 
compensation is possible (but probably not cheap?).

Is this because the transmitter doesn’t generate literally a single wavelength? 
 Or is this a WDM issue?  Chuck says the pulses get smeared out in time, that 
sounds like the first one.

From: AF mailto:af-boun...@af.afmug.com>> On Behalf Of 
Chuck McCown via AF
Sent: Wednesday, January 24, 2024 3:56 PM
To: AnimalFarm Microwave Users Group mailto:af@af.afmug.com>>
Cc: ch...@go-mtc.com
Subject: Re: [AFMUG] optical TX power levels

Yeah, the pulses tend to get smeared out in time if there is too much 
dispersion.  Similar to trying to use too high level of QAM with SNR issues.

From: Josh Luthman
Sent: Wednesday, January 24, 2024 12:26 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] optical TX power levels

Even if the RX level is good?

> rx was within 0.3dBm on all 4 lanes on both sides

On Wed, Jan 24, 2024 at 1:22 PM Daniel Pautz via AF 
mailto:af@af.afmug.com>> wrote:
Yeah makes me think the two paths have different loss.   We have had that on 
mirrored paths,  or even single paths with crappy splices on one of the strands.

From: AF mailto:af-boun...@af.afmug.com>> On Behalf Of 
Chuck McCown via AF
Sent: Wednesday, January 24, 2024 11:12 AM
To: AnimalFarm Microwave Users Group mailto:af@af.afmug.com>>
Cc: ch...@go-mtc.com
Subject: Re: [AFMUG] optical TX power levels

Did anyone do dispersion testing on the fiber?

Chuck McCown
McCown Technology Corporation
8401 N Commerce Dr
Lake Point, Utah 84074
801-250-9503
435-830-4306 cell
www.mccowntech.com
www.microtrench-blades.com
www.terabitnetworks.com

From: Zach Underwood
Sent: Wednesday, January 24, 2024 12:07 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] optical TX power levels

tired again this morning and still no link. rx was within 0.3dBm on all 4 lanes 
on both sides. We got 10gb 80km to link up. This will do for now. We will be 
looking at getting 40gb 80km single lane optics or adding another site to fiber 
loop to shorten the footage to under 40km.

On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners 
mailto:cstann...@gmail.com>> wrote:
So both of those SFPs are within the tx power range.

100G may not work on a link that long unless you have dispersion compensation 
fiber on the path or in a huge loop in a box style at one end.

You likely cannot change tx power levels on those SFPs, they will run at the 
max they can do for that specific unit.

On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood 
mailto:zunder1...@gmail.com>> wrote:

TX Power   2~6.5dBm

I am struggling to get this 100gb link up. In the field this link is quoted at 
31 miles. The rx levels are -22 and -20 on both sides but I can't get it to 
link. I take the same optics to the lab and add 20dbm of attenuator to get 
almost the same rx levels as the field and it will link up.

I have added error-correction encoding reed-solomon per the user guide for 
links over 40km.

So far I have not found a way to change the TX levels in arista, the options 
are in the CLI but they dont seem to change the outcome. For me this is the 
first time dealing with 80km optics or 100gb optics over 10km.

switch is Arista DCS-7060SX2-48YC6-R

https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
https://www.fs.com/products/115818.html?attribute=29032&id=3462585

On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners 
mailto:cstann...@gmail.com>> wrote:
There should be. What does their datasheey indicate for tx power range?

On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood 
mailto:zunder1...@gmail.com>> wrote:
Yep labels identical but there is a difference in default power levels.

On Wed, Jan 24, 2024, 8:13 AM Mike Hammett 
mailto:af...@ics-il.net>> wrote:
Oh, meaning the variance between the two, otherwise identical models?


-
Mike Hammett
Intelligent Computing Solutions

Midwest Internet Exchange

The Brothers WISP

Re: [AFMUG] optical TX power levels

[Chuck McCown via AF]

Gotta think of the Fourier series of the pulse.  Yes group velocities or group 
delay of the whole enchalada.  It is all kinda the same thing.  They were doing 
some kind of soliton fiber development.  Haven’t heard much for some time about 
that.  No idea how frequency pure/coherent the tx is.  I imagine phase 
coherency is a big deal. 



From: Ken Hohhof 
Sent: Wednesday, January 24, 2024 4:12 PM
To: 'AnimalFarm Microwave Users Group' 
Subject: Re: [AFMUG] optical TX power levels

Looks like different wavelengths have different group velocities, so 
compensation is possible (but probably not cheap?).

 

Is this because the transmitter doesn’t generate literally a single wavelength? 
 Or is this a WDM issue?  Chuck says the pulses get smeared out in time, that 
sounds like the first one.

 

From: AF  On Behalf Of Chuck McCown via AF
Sent: Wednesday, January 24, 2024 3:56 PM
To: AnimalFarm Microwave Users Group 
Cc: ch...@go-mtc.com
Subject: Re: [AFMUG] optical TX power levels

 

Yeah, the pulses tend to get smeared out in time if there is too much 
dispersion.  Similar to trying to use too high level of QAM with SNR issues.  

 

From: Josh Luthman 

Sent: Wednesday, January 24, 2024 12:26 PM

To: AnimalFarm Microwave Users Group 

Subject: Re: [AFMUG] optical TX power levels

 

Even if the RX level is good?

> rx was within 0.3dBm on all 4 lanes on both sides

 

On Wed, Jan 24, 2024 at 1:22 PM Daniel Pautz via AF  wrote:

  Yeah makes me think the two paths have different loss.   We have had that on 
mirrored paths,  or even single paths with crappy splices on one of the 
strands.  

   

  From: AF  On Behalf Of Chuck McCown via AF
  Sent: Wednesday, January 24, 2024 11:12 AM
  To: AnimalFarm Microwave Users Group 
  Cc: ch...@go-mtc.com
  Subject: Re: [AFMUG] optical TX power levels

   

  Did anyone do dispersion testing on the fiber?

   

  Chuck McCown
  McCown Technology Corporation
  8401 N Commerce Dr
  Lake Point, Utah 84074
  801-250-9503
  435-830-4306 cell 
  www.mccowntech.com
  www.microtrench-blades.com
  www.terabitnetworks.com

   

  From: Zach Underwood 

  Sent: Wednesday, January 24, 2024 12:07 PM

  To: AnimalFarm Microwave Users Group 

  Subject: Re: [AFMUG] optical TX power levels

   

  tired again this morning and still no link. rx was within 0.3dBm on all 4 
lanes on both sides. We got 10gb 80km to link up. This will do for now. We will 
be looking at getting 40gb 80km single lane optics or adding another site to 
fiber loop to shorten the footage to under 40km. 

   

  On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners  wrote:

So both of those SFPs are within the tx power range. 

 

100G may not work on a link that long unless you have dispersion 
compensation fiber on the path or in a huge loop in a box style at one end. 

 

You likely cannot change tx power levels on those SFPs, they will run at 
the max they can do for that specific unit.

 

On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood  wrote:


  TX Power   2~6.5dBm

   

  I am struggling to get this 100gb link up. In the field this link is 
quoted at 31 miles. The rx levels are -22 and -20 on both sides but I can't get 
it to link. I take the same optics to the lab and add 20dbm of attenuator to 
get almost the same rx levels as the field and it will link up. 

  I have added error-correction encoding reed-solomon per the user guide 
for links over 40km.

  So far I have not found a way to change the TX levels in arista, the 
options are in the CLI but they dont seem to change the outcome. For me this is 
the first time dealing with 80km optics or 100gb optics over 10km. 

  switch is Arista DCS-7060SX2-48YC6-R

   

  https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
  https://www.fs.com/products/115818.html?attribute=29032&id=3462585

   

  On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners  
wrote:

There should be. What does their datasheey indicate for tx power range?

 

On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood  
wrote:

  Yep labels identical but there is a difference in default power 
levels.

   

  On Wed, Jan 24, 2024, 8:13 AM Mike Hammett  wrote:

Oh, meaning the variance between the two, otherwise identical 
models?



-
Mike Hammett
Intelligent Computing Solutions

Midwest Internet Exchange

The Brothers WISP








From: "Zach Underwood" 
To: "AnimalFarm Microwave Users Group" 
Sent: Tuesday, January 23, 2024 12:51:39 PM
Subject: [AFMUG] optical TX power levels

I got 2x 100gb 80km optics from FS that run difficult default TX 
power levels one is 3.81dBm and the other 2.63dBm, the config on the arista 
devices hosting the optics is the same. 

 

Re: [AFMUG] optical TX power levels

[Ken Hohhof]

Looks like different wavelengths have different group velocities, so 
compensation is possible (but probably not cheap?).

 

Is this because the transmitter doesn’t generate literally a single wavelength? 
 Or is this a WDM issue?  Chuck says the pulses get smeared out in time, that 
sounds like the first one.

 

From: AF  On Behalf Of Chuck McCown via AF
Sent: Wednesday, January 24, 2024 3:56 PM
To: AnimalFarm Microwave Users Group 
Cc: ch...@go-mtc.com
Subject: Re: [AFMUG] optical TX power levels

 

Yeah, the pulses tend to get smeared out in time if there is too much 
dispersion.  Similar to trying to use too high level of QAM with SNR issues.  

 

From: Josh Luthman 

Sent: Wednesday, January 24, 2024 12:26 PM

To: AnimalFarm Microwave Users Group 

Subject: Re: [AFMUG] optical TX power levels

 

Even if the RX level is good?

> rx was within 0.3dBm on all 4 lanes on both sides

 

On Wed, Jan 24, 2024 at 1:22 PM Daniel Pautz via AF mailto:af@af.afmug.com> > wrote:

Yeah makes me think the two paths have different loss.   We have had that on 
mirrored paths,  or even single paths with crappy splices on one of the 
strands.  

 

From: AF mailto:af-boun...@af.afmug.com> > On Behalf 
Of Chuck McCown via AF
Sent: Wednesday, January 24, 2024 11:12 AM
To: AnimalFarm Microwave Users Group mailto:af@af.afmug.com> >
Cc: ch...@go-mtc.com  
Subject: Re: [AFMUG] optical TX power levels

 

Did anyone do dispersion testing on the fiber?

 

Chuck McCown
McCown Technology Corporation
8401 N Commerce Dr
Lake Point, Utah 84074
801-250-9503
435-830-4306 cell 
www.mccowntech.com  
www.microtrench-blades.com  
www.terabitnetworks.com  

 

From: Zach Underwood 

Sent: Wednesday, January 24, 2024 12:07 PM

To: AnimalFarm Microwave Users Group 

Subject: Re: [AFMUG] optical TX power levels

 

tired again this morning and still no link. rx was within 0.3dBm on all 4 lanes 
on both sides. We got 10gb 80km to link up. This will do for now. We will be 
looking at getting 40gb 80km single lane optics or adding another site to fiber 
loop to shorten the footage to under 40km. 

 

On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners mailto:cstann...@gmail.com> > wrote:

So both of those SFPs are within the tx power range. 

 

100G may not work on a link that long unless you have dispersion compensation 
fiber on the path or in a huge loop in a box style at one end. 

 

You likely cannot change tx power levels on those SFPs, they will run at the 
max they can do for that specific unit.

 

On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood mailto:zunder1...@gmail.com> > wrote:


TX Power   2~6.5dBm

 

I am struggling to get this 100gb link up. In the field this link is quoted at 
31 miles. The rx levels are -22 and -20 on both sides but I can't get it to 
link. I take the same optics to the lab and add 20dbm of attenuator to get 
almost the same rx levels as the field and it will link up. 

I have added error-correction encoding reed-solomon per the user guide for 
links over 40km.

So far I have not found a way to change the TX levels in arista, the options 
are in the CLI but they dont seem to change the outcome. For me this is the 
first time dealing with 80km optics or 100gb optics over 10km. 

switch is Arista DCS-7060SX2-48YC6-R

 

https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
https://www.fs.com/products/115818.html?attribute=29032 
 &id=3462585

 

On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners mailto:cstann...@gmail.com> > wrote:

There should be. What does their datasheey indicate for tx power range?

 

On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood mailto:zunder1...@gmail.com> > wrote:

Yep labels identical but there is a difference in default power levels.

 

On Wed, Jan 24, 2024, 8:13 AM Mike Hammett mailto:af...@ics-il.net> > wrote:

Oh, meaning the variance between the two, otherwise identical models?



-
Mike Hammett
  Intelligent Computing Solutions
  
Midwest Internet Exchange

The Brothers WISP






  _  


From: "Zach Underwood" 
To: "AnimalFarm Microwave Users Group" 
Sent: Tuesday, January 23, 2024 12:51:39 PM
Subject: [AFMUG] optical TX power levels

I got 2x 100gb 80km optics from FS that run difficult default TX power levels 
one is 3.81dBm and the other 2.63dBm, the config on the arista devices hosting 
the optics is the same. 

 

Has anyone seen much difference between optic like this? My sample size is 
small due to the optices costing $4k each

 

-- 

Zach Underwood (RHCE,RHCSA,RHCT,UACA) 

My website

advance-networking.com


-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com

 

-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com

-- 
AF mailing list
AF@af.afmu

Re: [AFMUG] optical TX power levels

[Chuck McCown via AF]

Yeah, the pulses tend to get smeared out in time if there is too much 
dispersion.  Similar to trying to use too high level of QAM with SNR issues.  

From: Josh Luthman 
Sent: Wednesday, January 24, 2024 12:26 PM
To: AnimalFarm Microwave Users Group 
Subject: Re: [AFMUG] optical TX power levels

Even if the RX level is good?

> rx was within 0.3dBm on all 4 lanes on both sides

On Wed, Jan 24, 2024 at 1:22 PM Daniel Pautz via AF  wrote:

  Yeah makes me think the two paths have different loss.   We have had that on 
mirrored paths,  or even single paths with crappy splices on one of the 
strands.  



  From: AF  On Behalf Of Chuck McCown via AF
  Sent: Wednesday, January 24, 2024 11:12 AM
  To: AnimalFarm Microwave Users Group 
  Cc: ch...@go-mtc.com
  Subject: Re: [AFMUG] optical TX power levels



  Did anyone do dispersion testing on the fiber?



  Chuck McCown
  McCown Technology Corporation
  8401 N Commerce Dr
  Lake Point, Utah 84074
  801-250-9503
  435-830-4306 cell 
  www.mccowntech.com
  www.microtrench-blades.com
  www.terabitnetworks.com



  From: Zach Underwood 

  Sent: Wednesday, January 24, 2024 12:07 PM

  To: AnimalFarm Microwave Users Group 

  Subject: Re: [AFMUG] optical TX power levels



  tired again this morning and still no link. rx was within 0.3dBm on all 4 
lanes on both sides. We got 10gb 80km to link up. This will do for now. We will 
be looking at getting 40gb 80km single lane optics or adding another site to 
fiber loop to shorten the footage to under 40km. 



  On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners  wrote:

So both of those SFPs are within the tx power range. 



100G may not work on a link that long unless you have dispersion 
compensation fiber on the path or in a huge loop in a box style at one end. 



You likely cannot change tx power levels on those SFPs, they will run at 
the max they can do for that specific unit.



On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood  wrote:


  TX Power   2~6.5dBm



  I am struggling to get this 100gb link up. In the field this link is 
quoted at 31 miles. The rx levels are -22 and -20 on both sides but I can't get 
it to link. I take the same optics to the lab and add 20dbm of attenuator to 
get almost the same rx levels as the field and it will link up. 

  I have added error-correction encoding reed-solomon per the user guide 
for links over 40km.

  So far I have not found a way to change the TX levels in arista, the 
options are in the CLI but they dont seem to change the outcome. For me this is 
the first time dealing with 80km optics or 100gb optics over 10km. 

  switch is Arista DCS-7060SX2-48YC6-R



  https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
  https://www.fs.com/products/115818.html?attribute=29032&id=3462585



  On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners  
wrote:

There should be. What does their datasheey indicate for tx power range?



On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood  
wrote:

  Yep labels identical but there is a difference in default power 
levels.



  On Wed, Jan 24, 2024, 8:13 AM Mike Hammett  wrote:

Oh, meaning the variance between the two, otherwise identical 
models?



-
Mike Hammett
Intelligent Computing Solutions

Midwest Internet Exchange

The Brothers WISP








From: "Zach Underwood" 
To: "AnimalFarm Microwave Users Group" 
Sent: Tuesday, January 23, 2024 12:51:39 PM
Subject: [AFMUG] optical TX power levels

I got 2x 100gb 80km optics from FS that run difficult default TX 
power levels one is 3.81dBm and the other 2.63dBm, the config on the arista 
devices hosting the optics is the same. 



Has anyone seen much difference between optic like this? My sample 
size is small due to the optices costing $4k each



-- 

Zach Underwood (RHCE,RHCSA,RHCT,UACA) 

My website

advance-networking.com


-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com



-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com

  -- 
  AF mailing list
  AF@af.afmug.com
  http://af.afmug.com/mailman/listinfo/af_af.afmug.com

-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com





  -- 

  Zach Underwood (RHCE,RHCSA,RHCT,UACA) 

  My website

  advance-networking.com

  -- 
  AF mailing list
  AF@af.afmug.com
  http://af.afmug.com/mailman/listinfo/af_af.afmug.com

-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listin

Re: [AFMUG] optical TX power levels

[Colin Stanners]

I doubt that rx level is the problem here. Dispersion becomes a bigger
problem once you go past 10G speeds, on those long links.

On Wed, Jan 24, 2024, 12:27 p.m. Josh Luthman 
wrote:

> Even if the RX level is good?
>
> > rx was within 0.3dBm on all 4 lanes on both sides
>
> On Wed, Jan 24, 2024 at 1:22 PM Daniel Pautz via AF 
> wrote:
>
>> Yeah makes me think the two paths have different loss.   We have had that
>> on mirrored paths,  or even single paths with crappy splices on one of the
>> strands.
>>
>>
>>
>> *From:* AF  *On Behalf Of * Chuck McCown via AF
>> *Sent:* Wednesday, January 24, 2024 11:12 AM
>> *To:* AnimalFarm Microwave Users Group 
>> *Cc:* ch...@go-mtc.com
>> *Subject:* Re: [AFMUG] optical TX power levels
>>
>>
>>
>> Did anyone do dispersion testing on the fiber?
>>
>>
>>
>> Chuck McCown
>> McCown Technology Corporation
>> 8401 N Commerce Dr
>> Lake Point, Utah 84074
>> 801-250-9503
>> 435-830-4306 cell
>> www.mccowntech.com
>> www.microtrench-blades.com
>> www.terabitnetworks.com
>>
>>
>>
>> *From:* Zach Underwood
>>
>> *Sent:* Wednesday, January 24, 2024 12:07 PM
>>
>> *To:* AnimalFarm Microwave Users Group
>>
>> *Subject:* Re: [AFMUG] optical TX power levels
>>
>>
>>
>> tired again this morning and still no link. rx was within 0.3dBm on all 4
>> lanes on both sides. We got 10gb 80km to link up. This will do for now. We
>> will be looking at getting 40gb 80km single lane optics or adding another
>> site to fiber loop to shorten the footage to under 40km.
>>
>>
>>
>> On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners 
>> wrote:
>>
>> So both of those SFPs are within the tx power range.
>>
>>
>>
>> 100G may not work on a link that long unless you have dispersion
>> compensation fiber on the path or in a huge loop in a box style at one end.
>>
>>
>>
>> You likely cannot change tx power levels on those SFPs, they will run at
>> the max they can do for that specific unit.
>>
>>
>>
>> On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood 
>> wrote:
>>
>>
>> *TX Power*   2~6.5dBm
>>
>>
>>
>> I am struggling to get this 100gb link up. In the field this link is
>> quoted at 31 miles. The rx levels are -22 and -20 on both sides but I can't
>> get it to link. I take the same optics to the lab and add 20dbm of attenuator
>> to get almost the same rx levels as the field and it will link up.
>>
>> I have added error-correction encoding reed-solomon per the user guide
>> for links over 40km.
>>
>> So far I have not found a way to change the TX levels in arista, the
>> options are in the CLI but they dont seem to change the outcome. For me
>> this is the first time dealing with 80km optics or 100gb optics over 10km.
>>
>> switch is Arista DCS-7060SX2-48YC6-R
>>
>>
>>
>> https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
>> https://www.fs.com/products/115818.html?attribute=29032&id=3462585
>>
>>
>>
>> On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners 
>> wrote:
>>
>> There should be. What does their datasheey indicate for tx power range?
>>
>>
>>
>> On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood 
>> wrote:
>>
>> Yep labels identical but there is a difference in default power levels.
>>
>>
>>
>> On Wed, Jan 24, 2024, 8:13 AM Mike Hammett  wrote:
>>
>> Oh, meaning the variance between the two, otherwise identical models?
>>
>>
>>
>> -
>> Mike Hammett
>> Intelligent Computing Solutions 
>> 
>> 
>> 
>> 
>> Midwest Internet Exchange 
>> 
>> 
>> 
>> The Brothers WISP 
>> 
>>
>>
>> 
>> --
>>
>> *From: *"Zach Underwood" 
>> *To: *"AnimalFarm Microwave Users Group" 
>> *Sent: *Tuesday, January 23, 2024 12:51:39 PM
>> *Subject: *[AFMUG] optical TX power levels
>>
>> I got 2x 100gb 80km optics from FS that run difficult default TX power
>> levels one is 3.81dBm and the other 2.63dBm, the config on the arista
>> devices hosting the optics is the same.
>>
>>
>>
>> Has anyone seen much difference between optic like this? My sample size
>> is small due to the optices costing $4k each
>>
>>
>>
>> --
>>
>> Zach Underwood (RHCE,RHCSA,RHCT,UACA)
>>
>> My website 
>>
>> advance-networking.com
>>
>>
>> --
>> AF mailing list
>> AF@af.afmug.com
>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>
>>
>>
>> --
>> AF mailing list
>> AF@af.afmug.com
>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>
>> --
>> AF mailing list
>> AF@af.afmug.com
>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>
>> --
>> AF mailing list
>> AF@af.afmug.com
>> http://af.afmug.com/mailman/li

Re: [AFMUG] optical TX power levels

[Josh Luthman]

Even if the RX level is good?

> rx was within 0.3dBm on all 4 lanes on both sides

On Wed, Jan 24, 2024 at 1:22 PM Daniel Pautz via AF  wrote:

> Yeah makes me think the two paths have different loss.   We have had that
> on mirrored paths,  or even single paths with crappy splices on one of the
> strands.
>
>
>
> *From:* AF  *On Behalf Of * Chuck McCown via AF
> *Sent:* Wednesday, January 24, 2024 11:12 AM
> *To:* AnimalFarm Microwave Users Group 
> *Cc:* ch...@go-mtc.com
> *Subject:* Re: [AFMUG] optical TX power levels
>
>
>
> Did anyone do dispersion testing on the fiber?
>
>
>
> Chuck McCown
> McCown Technology Corporation
> 8401 N Commerce Dr
> Lake Point, Utah 84074
> 801-250-9503
> 435-830-4306 cell
> www.mccowntech.com
> www.microtrench-blades.com
> www.terabitnetworks.com
>
>
>
> *From:* Zach Underwood
>
> *Sent:* Wednesday, January 24, 2024 12:07 PM
>
> *To:* AnimalFarm Microwave Users Group
>
> *Subject:* Re: [AFMUG] optical TX power levels
>
>
>
> tired again this morning and still no link. rx was within 0.3dBm on all 4
> lanes on both sides. We got 10gb 80km to link up. This will do for now. We
> will be looking at getting 40gb 80km single lane optics or adding another
> site to fiber loop to shorten the footage to under 40km.
>
>
>
> On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners 
> wrote:
>
> So both of those SFPs are within the tx power range.
>
>
>
> 100G may not work on a link that long unless you have dispersion
> compensation fiber on the path or in a huge loop in a box style at one end.
>
>
>
> You likely cannot change tx power levels on those SFPs, they will run at
> the max they can do for that specific unit.
>
>
>
> On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood 
> wrote:
>
>
> *TX Power*   2~6.5dBm
>
>
>
> I am struggling to get this 100gb link up. In the field this link is
> quoted at 31 miles. The rx levels are -22 and -20 on both sides but I can't
> get it to link. I take the same optics to the lab and add 20dbm of attenuator
> to get almost the same rx levels as the field and it will link up.
>
> I have added error-correction encoding reed-solomon per the user guide for
> links over 40km.
>
> So far I have not found a way to change the TX levels in arista, the
> options are in the CLI but they dont seem to change the outcome. For me
> this is the first time dealing with 80km optics or 100gb optics over 10km.
>
> switch is Arista DCS-7060SX2-48YC6-R
>
>
>
> https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
> https://www.fs.com/products/115818.html?attribute=29032&id=3462585
>
>
>
> On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners 
> wrote:
>
> There should be. What does their datasheey indicate for tx power range?
>
>
>
> On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood 
> wrote:
>
> Yep labels identical but there is a difference in default power levels.
>
>
>
> On Wed, Jan 24, 2024, 8:13 AM Mike Hammett  wrote:
>
> Oh, meaning the variance between the two, otherwise identical models?
>
>
>
> -
> Mike Hammett
> Intelligent Computing Solutions 
> 
> 
> 
> 
> Midwest Internet Exchange 
> 
> 
> 
> The Brothers WISP 
> 
>
>
> 
> --
>
> *From: *"Zach Underwood" 
> *To: *"AnimalFarm Microwave Users Group" 
> *Sent: *Tuesday, January 23, 2024 12:51:39 PM
> *Subject: *[AFMUG] optical TX power levels
>
> I got 2x 100gb 80km optics from FS that run difficult default TX power
> levels one is 3.81dBm and the other 2.63dBm, the config on the arista
> devices hosting the optics is the same.
>
>
>
> Has anyone seen much difference between optic like this? My sample size is
> small due to the optices costing $4k each
>
>
>
> --
>
> Zach Underwood (RHCE,RHCSA,RHCT,UACA)
>
> My website 
>
> advance-networking.com
>
>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
>
>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
>
>
>
>
> --
>
> Zach Underwood (RHCE,RHCSA,RHCT,UACA)
>
> My website 
>
> advance-networking.com
>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
>
>
>
>
> --
>
> Zach Under

Re: [AFMUG] optical TX power levels

[Daniel Pautz via AF]

Yeah makes me think the two paths have different loss.   We have had that on 
mirrored paths,  or even single paths with crappy splices on one of the strands.

From: AF  On Behalf Of Chuck McCown via AF
Sent: Wednesday, January 24, 2024 11:12 AM
To: AnimalFarm Microwave Users Group 
Cc: ch...@go-mtc.com
Subject: Re: [AFMUG] optical TX power levels

Did anyone do dispersion testing on the fiber?

Chuck McCown
McCown Technology Corporation
8401 N Commerce Dr
Lake Point, Utah 84074
801-250-9503
435-830-4306 cell
www.mccowntech.com
www.microtrench-blades.com
www.terabitnetworks.com

From: Zach Underwood
Sent: Wednesday, January 24, 2024 12:07 PM
To: AnimalFarm Microwave Users Group
Subject: Re: [AFMUG] optical TX power levels

tired again this morning and still no link. rx was within 0.3dBm on all 4 lanes 
on both sides. We got 10gb 80km to link up. This will do for now. We will be 
looking at getting 40gb 80km single lane optics or adding another site to fiber 
loop to shorten the footage to under 40km.

On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners 
mailto:cstann...@gmail.com>> wrote:
So both of those SFPs are within the tx power range.

100G may not work on a link that long unless you have dispersion compensation 
fiber on the path or in a huge loop in a box style at one end.

You likely cannot change tx power levels on those SFPs, they will run at the 
max they can do for that specific unit.

On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood 
mailto:zunder1...@gmail.com>> wrote:

TX Power   2~6.5dBm

I am struggling to get this 100gb link up. In the field this link is quoted at 
31 miles. The rx levels are -22 and -20 on both sides but I can't get it to 
link. I take the same optics to the lab and add 20dbm of attenuator to get 
almost the same rx levels as the field and it will link up.

I have added error-correction encoding reed-solomon per the user guide for 
links over 40km.

So far I have not found a way to change the TX levels in arista, the options 
are in the CLI but they dont seem to change the outcome. For me this is the 
first time dealing with 80km optics or 100gb optics over 10km.

switch is Arista DCS-7060SX2-48YC6-R

https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
https://www.fs.com/products/115818.html?attribute=29032&id=3462585

On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners 
mailto:cstann...@gmail.com>> wrote:
There should be. What does their datasheey indicate for tx power range?

On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood 
mailto:zunder1...@gmail.com>> wrote:
Yep labels identical but there is a difference in default power levels.

On Wed, Jan 24, 2024, 8:13 AM Mike Hammett 
mailto:af...@ics-il.net>> wrote:
Oh, meaning the variance between the two, otherwise identical models?


-
Mike Hammett
Intelligent Computing Solutions
[http://www.ics-il.com/images/fbicon.png][http://www.ics-il.com/images/googleicon.png][http://www.ics-il.com/images/linkedinicon.png][http://www.ics-il.com/images/twittericon.png]
Midwest Internet Exchange
[http://www.ics-il.com/images/fbicon.png][http://www.ics-il.com/images/linkedinicon.png][http://www.ics-il.com/images/twittericon.png]
The Brothers WISP
[http://www.ics-il.com/images/fbicon.png][http://www.ics-il.com/images/youtubeicon.png]




From: "Zach Underwood" mailto:zunder1...@gmail.com>>
To: "AnimalFarm Microwave Users Group" mailto:af@af.afmug.com>>
Sent: Tuesday, January 23, 2024 12:51:39 PM
Subject: [AFMUG] optical TX power levels
I got 2x 100gb 80km optics from FS that run difficult default TX power levels 
one is 3.81dBm and the other 2.63dBm, the config on the arista devices hosting 
the optics is the same.

Has anyone seen much difference between optic like this? My sample size is 
small due to the optices costing $4k each

--
Zach Underwood (RHCE,RHCSA,RHCT,UACA)
My website
advance-networking.com

--
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com

--
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com
--
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com
--
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com


--
Zach Underwood (RHCE,RH

Re: [AFMUG] optical TX power levels

[Zach Underwood]

I am not familiar  dispersion testing but we ask the outside plant provider
about  that.

On Wed, Jan 24, 2024 at 1:13 PM Chuck McCown via AF  wrote:

> Did anyone do dispersion testing on the fiber?
>
> Chuck McCown
> McCown Technology Corporation
> 8401 N Commerce Dr
> Lake Point, Utah 84074
> 801-250-9503
> 435-830-4306 cell
> www.mccowntech.com
> www.microtrench-blades.com
> www.terabitnetworks.com
>
> *From:* Zach Underwood
> *Sent:* Wednesday, January 24, 2024 12:07 PM
> *To:* AnimalFarm Microwave Users Group
> *Subject:* Re: [AFMUG] optical TX power levels
>
> tired again this morning and still no link. rx was within 0.3dBm on all 4
> lanes on both sides. We got 10gb 80km to link up. This will do for now. We
> will be looking at getting 40gb 80km single lane optics or adding another
> site to fiber loop to shorten the footage to under 40km.
>
> On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners 
> wrote:
>
>> So both of those SFPs are within the tx power range.
>>
>> 100G may not work on a link that long unless you have dispersion
>> compensation fiber on the path or in a huge loop in a box style at one end.
>>
>> You likely cannot change tx power levels on those SFPs, they will run at
>> the max they can do for that specific unit.
>>
>>
>> On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood 
>> wrote:
>>
>>>
>>> TX Power   2~6.5dBm
>>>
>>> I am struggling to get this 100gb link up. In the field this link is
>>> quoted at 31 miles. The rx levels are -22 and -20 on both sides but I can't
>>> get it to link. I take the same optics to the lab and add 20dbm of 
>>> attenuator
>>> to get almost the same rx levels as the field and it will link up.
>>>
>>> I have added error-correction encoding reed-solomon per the user guide
>>> for links over 40km.
>>>
>>> So far I have not found a way to change the TX levels in arista, the
>>> options are in the CLI but they dont seem to change the outcome. For me
>>> this is the first time dealing with 80km optics or 100gb optics over 10km.
>>>
>>> switch is Arista DCS-7060SX2-48YC6-R
>>>
>>> https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
>>> https://www.fs.com/products/115818.html?attribute=29032&id=3462585
>>>
>>> On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners 
>>> wrote:
>>>
 There should be. What does their datasheey indicate for tx power range?

 On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood 
 wrote:

> Yep labels identical but there is a difference in default power levels.
>
> On Wed, Jan 24, 2024, 8:13 AM Mike Hammett  wrote:
>
>> Oh, meaning the variance between the two, otherwise identical models?
>>
>>
>>
>> -
>> Mike Hammett
>> Intelligent Computing Solutions 
>> 
>> 
>> 
>> 
>> Midwest Internet Exchange 
>> 
>> 
>> 
>> The Brothers WISP 
>> 
>>
>>
>> 
>> --
>> *From: *"Zach Underwood" 
>> *To: *"AnimalFarm Microwave Users Group" 
>> *Sent: *Tuesday, January 23, 2024 12:51:39 PM
>> *Subject: *[AFMUG] optical TX power levels
>>
>> I got 2x 100gb 80km optics from FS that run difficult default TX
>> power levels one is 3.81dBm and the other 2.63dBm, the config on the 
>> arista
>> devices hosting the optics is the same.
>>
>> Has anyone seen much difference between optic like this? My sample
>> size is small due to the optices costing $4k each
>>
>> --
>> Zach Underwood (RHCE,RHCSA,RHCT,UACA)
>> My website 
>> advance-networking.com
>>
>> --
>> AF mailing list
>> AF@af.afmug.com
>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>
>> --
>> AF mailing list
>> AF@af.afmug.com
>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
 --
 AF mailing list
 AF@af.afmug.com
 http://af.afmug.com/mailman/listinfo/af_af.afmug.com

>>>
>>>
>>> --
>>> Zach Underwood (RHCE,RHCSA,RHCT,UACA)
>>> My website 
>>> advance-networking.com
>>> --
>>> AF mailing list
>>> AF@af.afmug.com
>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>>
>> --
>> AF mailing list
>> AF@af.afmug.com
>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>
>
>
> --
> Zach Underwood (RHCE,RHCSA,RHCT,UACA)
> My website 
> adva

Re: [AFMUG] optical TX power levels

[Chuck McCown via AF]

Did anyone do dispersion testing on the fiber?

Chuck McCown
McCown Technology Corporation
8401 N Commerce Dr
Lake Point, Utah 84074
801-250-9503
435-830-4306 cell 
www.mccowntech.com
www.microtrench-blades.com
www.terabitnetworks.com


From: Zach Underwood 
Sent: Wednesday, January 24, 2024 12:07 PM
To: AnimalFarm Microwave Users Group 
Subject: Re: [AFMUG] optical TX power levels

tired again this morning and still no link. rx was within 0.3dBm on all 4 lanes 
on both sides. We got 10gb 80km to link up. This will do for now. We will be 
looking at getting 40gb 80km single lane optics or adding another site to fiber 
loop to shorten the footage to under 40km. 

On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners  wrote:

  So both of those SFPs are within the tx power range. 

  100G may not work on a link that long unless you have dispersion compensation 
fiber on the path or in a huge loop in a box style at one end. 

  You likely cannot change tx power levels on those SFPs, they will run at the 
max they can do for that specific unit.



  On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood  wrote:


TX Power   2~6.5dBm



I am struggling to get this 100gb link up. In the field this link is quoted 
at 31 miles. The rx levels are -22 and -20 on both sides but I can't get it to 
link. I take the same optics to the lab and add 20dbm of attenuator to get 
almost the same rx levels as the field and it will link up. 

I have added error-correction encoding reed-solomon per the user guide for 
links over 40km.

So far I have not found a way to change the TX levels in arista, the 
options are in the CLI but they dont seem to change the outcome. For me this is 
the first time dealing with 80km optics or 100gb optics over 10km. 

switch is Arista DCS-7060SX2-48YC6-R


https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
https://www.fs.com/products/115818.html?attribute=29032&id=3462585


On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners  wrote:

  There should be. What does their datasheey indicate for tx power range?

  On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood  
wrote:

Yep labels identical but there is a difference in default power levels.

On Wed, Jan 24, 2024, 8:13 AM Mike Hammett  wrote:

  Oh, meaning the variance between the two, otherwise identical models?




  -
  Mike Hammett
  Intelligent Computing Solutions

  Midwest Internet Exchange

  The Brothers WISP






--

  From: "Zach Underwood" 
  To: "AnimalFarm Microwave Users Group" 
  Sent: Tuesday, January 23, 2024 12:51:39 PM
  Subject: [AFMUG] optical TX power levels


  I got 2x 100gb 80km optics from FS that run difficult default TX 
power levels one is 3.81dBm and the other 2.63dBm, the config on the arista 
devices hosting the optics is the same. 

  Has anyone seen much difference between optic like this? My sample 
size is small due to the optices costing $4k each


  -- 

  Zach Underwood (RHCE,RHCSA,RHCT,UACA) 
  My website

  advance-networking.com


  -- 
  AF mailing list
  AF@af.afmug.com
  http://af.afmug.com/mailman/listinfo/af_af.afmug.com


  -- 
  AF mailing list
  AF@af.afmug.com
  http://af.afmug.com/mailman/listinfo/af_af.afmug.com

-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com

  -- 
  AF mailing list
  AF@af.afmug.com
  http://af.afmug.com/mailman/listinfo/af_af.afmug.com



-- 

Zach Underwood (RHCE,RHCSA,RHCT,UACA) 
My website

advance-networking.com

-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com

  -- 
  AF mailing list
  AF@af.afmug.com
  http://af.afmug.com/mailman/listinfo/af_af.afmug.com



-- 

Zach Underwood (RHCE,RHCSA,RHCT,UACA) 
My website

advance-networking.com




-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com
-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com

Re: [AFMUG] optical TX power levels

[Zach Underwood]

tired again this morning and still no link. rx was within 0.3dBm on all 4
lanes on both sides. We got 10gb 80km to link up. This will do for now. We
will be looking at getting 40gb 80km single lane optics or adding another
site to fiber loop to shorten the footage to under 40km.

On Wed, Jan 24, 2024 at 11:14 AM Colin Stanners  wrote:

> So both of those SFPs are within the tx power range.
>
> 100G may not work on a link that long unless you have dispersion
> compensation fiber on the path or in a huge loop in a box style at one end.
>
> You likely cannot change tx power levels on those SFPs, they will run at
> the max they can do for that specific unit.
>
>
> On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood 
> wrote:
>
>>
>> TX Power   2~6.5dBm
>>
>> I am struggling to get this 100gb link up. In the field this link is
>> quoted at 31 miles. The rx levels are -22 and -20 on both sides but I
>> can't get it to link. I take the same optics to the lab and add 20dbm of 
>> attenuator
>> to get almost the same rx levels as the field and it will link up.
>>
>> I have added error-correction encoding reed-solomon per the user guide
>> for links over 40km.
>>
>> So far I have not found a way to change the TX levels in arista, the
>> options are in the CLI but they dont seem to change the outcome. For me
>> this is the first time dealing with 80km optics or 100gb optics over 10km.
>>
>> switch is Arista DCS-7060SX2-48YC6-R
>>
>> https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
>> https://www.fs.com/products/115818.html?attribute=29032&id=3462585
>>
>> On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners 
>> wrote:
>>
>>> There should be. What does their datasheey indicate for tx power range?
>>>
>>> On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood 
>>> wrote:
>>>
 Yep labels identical but there is a difference in default power levels.

 On Wed, Jan 24, 2024, 8:13 AM Mike Hammett  wrote:

> Oh, meaning the variance between the two, otherwise identical models?
>
>
>
> -
> Mike Hammett
> Intelligent Computing Solutions 
> 
> 
> 
> 
> Midwest Internet Exchange 
> 
> 
> 
> The Brothers WISP 
> 
>
>
> 
> --
> *From: *"Zach Underwood" 
> *To: *"AnimalFarm Microwave Users Group" 
> *Sent: *Tuesday, January 23, 2024 12:51:39 PM
> *Subject: *[AFMUG] optical TX power levels
>
> I got 2x 100gb 80km optics from FS that run difficult default TX power
> levels one is 3.81dBm and the other 2.63dBm, the config on the arista
> devices hosting the optics is the same.
>
> Has anyone seen much difference between optic like this? My sample
> size is small due to the optices costing $4k each
>
> --
> Zach Underwood (RHCE,RHCSA,RHCT,UACA)
> My website 
> advance-networking.com
>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
 --
 AF mailing list
 AF@af.afmug.com
 http://af.afmug.com/mailman/listinfo/af_af.afmug.com

>>> --
>>> AF mailing list
>>> AF@af.afmug.com
>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>>
>>
>>
>> --
>> Zach Underwood (RHCE,RHCSA,RHCT,UACA)
>> My website 
>> advance-networking.com
>> --
>> AF mailing list
>> AF@af.afmug.com
>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>


-- 
Zach Underwood (RHCE,RHCSA,RHCT,UACA)
My website 
advance-networking.com
-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com

Re: [AFMUG] optical TX power levels

[Colin Stanners]

So both of those SFPs are within the tx power range.

100G may not work on a link that long unless you have dispersion
compensation fiber on the path or in a huge loop in a box style at one end.

You likely cannot change tx power levels on those SFPs, they will run at
the max they can do for that specific unit.


On Wed, Jan 24, 2024, 7:46 a.m. Zach Underwood  wrote:

>
> TX Power   2~6.5dBm
>
> I am struggling to get this 100gb link up. In the field this link is
> quoted at 31 miles. The rx levels are -22 and -20 on both sides but I
> can't get it to link. I take the same optics to the lab and add 20dbm of 
> attenuator
> to get almost the same rx levels as the field and it will link up.
>
> I have added error-correction encoding reed-solomon per the user guide for
> links over 40km.
>
> So far I have not found a way to change the TX levels in arista, the
> options are in the CLI but they dont seem to change the outcome. For me
> this is the first time dealing with 80km optics or 100gb optics over 10km.
>
> switch is Arista DCS-7060SX2-48YC6-R
>
> https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
> https://www.fs.com/products/115818.html?attribute=29032&id=3462585
>
> On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners 
> wrote:
>
>> There should be. What does their datasheey indicate for tx power range?
>>
>> On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood 
>> wrote:
>>
>>> Yep labels identical but there is a difference in default power levels.
>>>
>>> On Wed, Jan 24, 2024, 8:13 AM Mike Hammett  wrote:
>>>
 Oh, meaning the variance between the two, otherwise identical models?



 -
 Mike Hammett
 Intelligent Computing Solutions 
 
 
 
 
 Midwest Internet Exchange 
 
 
 
 The Brothers WISP 
 


 
 --
 *From: *"Zach Underwood" 
 *To: *"AnimalFarm Microwave Users Group" 
 *Sent: *Tuesday, January 23, 2024 12:51:39 PM
 *Subject: *[AFMUG] optical TX power levels

 I got 2x 100gb 80km optics from FS that run difficult default TX power
 levels one is 3.81dBm and the other 2.63dBm, the config on the arista
 devices hosting the optics is the same.

 Has anyone seen much difference between optic like this? My sample size
 is small due to the optices costing $4k each

 --
 Zach Underwood (RHCE,RHCSA,RHCT,UACA)
 My website 
 advance-networking.com

 --
 AF mailing list
 AF@af.afmug.com
 http://af.afmug.com/mailman/listinfo/af_af.afmug.com

 --
 AF mailing list
 AF@af.afmug.com
 http://af.afmug.com/mailman/listinfo/af_af.afmug.com

>>> --
>>> AF mailing list
>>> AF@af.afmug.com
>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>>
>> --
>> AF mailing list
>> AF@af.afmug.com
>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>
>
>
> --
> Zach Underwood (RHCE,RHCSA,RHCT,UACA)
> My website 
> advance-networking.com
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com

Re: [AFMUG] optical TX power levels

[castarritt]

Do you need dispersion compensation for 100GBASE-ZR4?

On Wed, Jan 24, 2024 at 8:03 AM Mike Hammett  wrote:

> Well, and it would depend on which type of 100G. Some is 10x10, some is
> 25x4, and some is 100x1.
>
>
>
> -
> Mike Hammett
> Intelligent Computing Solutions 
> 
> 
> 
> 
> Midwest Internet Exchange 
> 
> 
> 
> The Brothers WISP 
> 
>
>
> 
> --
> *From: *dmmoff...@gmail.com
> *To: *"AnimalFarm Microwave Users Group" 
> *Sent: *Wednesday, January 24, 2024 7:53:21 AM
> *Subject: *Re: [AFMUG] optical TX power levels
>
> 100 gig is going to have I believe 4 wavelengths.  This command shows you
> the level on each channel:
>
>
>
> show interfaces et31/1 transceiver dom
>
>
>
> I think if one channel isn’t connected you wouldn’t get 100G link, but
> you’d still have receive power.  Bends and such can impact one channel and
> not another.
>
>
>
> This is just a WAG.  Good luck, sir.
>
>
>
>
>
>
>
> *From:* AF  *On Behalf Of *Zach Underwood
> *Sent:* Wednesday, January 24, 2024 8:45 AM
> *To:* AnimalFarm Microwave Users Group 
> *Subject:* Re: [AFMUG] optical TX power levels
>
>
>
>
> *TX Power*   2~6.5dBm
>
>
>
> I am struggling to get this 100gb link up. In the field this link is
> quoted at 31 miles. The rx levels are -22 and -20 on both sides but I
> can't get it to link. I take the same optics to the lab and add 20dbm of 
> attenuator
> to get almost the same rx levels as the field and it will link up.
>
> I have added error-correction encoding reed-solomon per the user guide for
> links over 40km.
>
> So far I have not found a way to change the TX levels in arista, the
> options are in the CLI but they dont seem to change the outcome. For me
> this is the first time dealing with 80km optics or 100gb optics over 10km.
>
> switch is Arista DCS-7060SX2-48YC6-R
>
>
>
> https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
> https://www.fs.com/products/115818.html?attribute=29032&id=3462585
>
>
>
> On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners 
> wrote:
>
> There should be. What does their datasheey indicate for tx power range?
>
>
>
> On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood 
> wrote:
>
> Yep labels identical but there is a difference in default power levels.
>
>
>
> On Wed, Jan 24, 2024, 8:13 AM Mike Hammett  wrote:
>
> Oh, meaning the variance between the two, otherwise identical models?
>
>
>
> -
> Mike Hammett
> Intelligent Computing Solutions 
> [image: Image removed by sender.] [image:
> Image removed by sender.]
> [image:
> Image removed by sender.]
> [image:
> Image removed by sender.] 
> Midwest Internet Exchange 
> [image: Image removed by sender.] [image:
> Image removed by sender.]
> [image: Image
> removed by sender.] 
> The Brothers WISP 
> [image: Image removed by sender.]
> [image: Image removed by
> sender.]
>
>
> 
> --
>
> *From: *"Zach Underwood" 
> *To: *"AnimalFarm Microwave Users Group" 
> *Sent: *Tuesday, January 23, 2024 12:51:39 PM
> *Subject: *[AFMUG] optical TX power levels
>
> I got 2x 100gb 80km optics from FS that run difficult default TX power
> levels one is 3.81dBm and the other 2.63dBm, the config on the arista
> devices hosting the optics is the same.
>
>
>
> Has anyone seen much difference between optic like this? My sample size is
> small due to the optices costing $4k each
>
>
>
> --
>
> Zach Underwood (RHCE,RHCSA,RHCT,UACA)
>
> My website 
>
> advance-networking.com
>
>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
>
>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
>
>
>
> --
>
> Zach Underwood (RHCE,RHCSA,RHCT,UACA)
>
> My website 
>
> advance-networking.com
>
> --
> AF mai

Re: [AFMUG] optical TX power levels

[Mike Hammett]

Well, and it would depend on which type of 100G. Some is 10x10, some is 25x4, 
and some is 100x1. 




- 
Mike Hammett 
Intelligent Computing Solutions 

Midwest Internet Exchange 

The Brothers WISP 




- Original Message -

From: dmmoff...@gmail.com 
To: "AnimalFarm Microwave Users Group"  
Sent: Wednesday, January 24, 2024 7:53:21 AM 
Subject: Re: [AFMUG] optical TX power levels 



100 gig is going to have I believe 4 wavelengths. This command shows you the 
level on each channel: 

show interfaces et31/1 transceiver dom 

I think if one channel isn’t connected you wouldn’t get 100G link, but you’d 
still have receive power. Bends and such can impact one channel and not 
another. 

This is just a WAG. Good luck, sir. 




From: AF  On Behalf Of Zach Underwood 
Sent: Wednesday, January 24, 2024 8:45 AM 
To: AnimalFarm Microwave Users Group  
Subject: Re: [AFMUG] optical TX power levels 




TX Power 2~6.5dBm 



I am struggling to get this 100gb link up. In the field this link is quoted at 
31 miles. The rx levels are -22 and -20 on both sides but I can't get it to 
link. I take the same optics to the lab and add 20dbm of attenuator to get 
almost the same rx levels as the field and it will link up. 

I have added error-correction encoding reed-solomon per the user guide for 
links over 40km. 

So far I have not found a way to change the TX levels in arista, the options 
are in the CLI but they dont seem to change the outcome. For me this is the 
first time dealing with 80km optics or 100gb optics over 10km. 

switch is Arista DCS-7060SX2-48YC6-R 


https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf 
https://www.fs.com/products/115818.html?attribute=29032&id=3462585 



On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners < cstann...@gmail.com > wrote: 



There should be. What does their datasheey indicate for tx power range? 



On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood < zunder1...@gmail.com > wrote: 



Yep labels identical but there is a difference in default power levels. 



On Wed, Jan 24, 2024, 8:13 AM Mike Hammett < af...@ics-il.net > wrote: 




Oh, meaning the variance between the two, otherwise identical models? 



- 
Mike Hammett 
Intelligent Computing Solutions 
Image removed by sender.Image removed by sender.Image removed by sender.Image 
removed by sender.
Midwest Internet Exchange 
Image removed by sender.Image removed by sender.Image removed by sender.
The Brothers WISP 
Image removed by sender.Image removed by sender.






From: "Zach Underwood" < zunder1...@gmail.com > 
To: "AnimalFarm Microwave Users Group" < af@af.afmug.com > 
Sent: Tuesday, January 23, 2024 12:51:39 PM 
Subject: [AFMUG] optical TX power levels 

I got 2x 100gb 80km optics from FS that run difficult default TX power levels 
one is 3.81dBm and the other 2.63dBm, the config on the arista devices hosting 
the optics is the same. 



Has anyone seen much difference between optic like this? My sample size is 
small due to the optices costing $4k each 



-- 






Zach Underwood (RHCE,RHCSA,RHCT,UACA) 



My website 

advance-networking.com 

-- 
AF mailing list 
AF@af.afmug.com 
http://af.afmug.com/mailman/listinfo/af_af.afmug.com 

-- 
AF mailing list 
AF@af.afmug.com 
http://af.afmug.com/mailman/listinfo/af_af.afmug.com 


-- 
AF mailing list 
AF@af.afmug.com 
http://af.afmug.com/mailman/listinfo/af_af.afmug.com 


-- 
AF mailing list 
AF@af.afmug.com 
http://af.afmug.com/mailman/listinfo/af_af.afmug.com 






-- 






Zach Underwood (RHCE,RHCSA,RHCT,UACA) 



My website 

advance-networking.com 
-- 
AF mailing list 
AF@af.afmug.com 
http://af.afmug.com/mailman/listinfo/af_af.afmug.com 

-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com

Re: [AFMUG] optical TX power levels

[dmmoffett]

100 gig is going to have I believe 4 wavelengths.  This command shows you the 
level on each channel:

 

show interfaces et31/1 transceiver dom 

 

I think if one channel isn’t connected you wouldn’t get 100G link, but you’d 
still have receive power.  Bends and such can impact one channel and not 
another. 

 

This is just a WAG.  Good luck, sir.

 

 

 

From: AF  On Behalf Of Zach Underwood
Sent: Wednesday, January 24, 2024 8:45 AM
To: AnimalFarm Microwave Users Group 
Subject: Re: [AFMUG] optical TX power levels

 


TX Power   2~6.5dBm

 

I am struggling to get this 100gb link up. In the field this link is quoted at 
31 miles. The rx levels are -22 and -20 on both sides but I can't get it to 
link. I take the same optics to the lab and add 20dbm of attenuator to get 
almost the same rx levels as the field and it will link up. 

I have added error-correction encoding reed-solomon per the user guide for 
links over 40km.

So far I have not found a way to change the TX levels in arista, the options 
are in the CLI but they dont seem to change the outcome. For me this is the 
first time dealing with 80km optics or 100gb optics over 10km. 

switch is Arista DCS-7060SX2-48YC6-R

 

https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
https://www.fs.com/products/115818.html?attribute=29032 
 &id=3462585

 

On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners mailto:cstann...@gmail.com> > wrote:

There should be. What does their datasheey indicate for tx power range?

 

On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood mailto:zunder1...@gmail.com> > wrote:

Yep labels identical but there is a difference in default power levels.

 

On Wed, Jan 24, 2024, 8:13 AM Mike Hammett mailto:af...@ics-il.net> > wrote:

Oh, meaning the variance between the two, otherwise identical models?



-
Mike Hammett
  Intelligent Computing Solutions
   
  
  
 
  Midwest Internet Exchange
   
  
 
  The Brothers WISP
   
 





  _  


From: "Zach Underwood" mailto:zunder1...@gmail.com> >
To: "AnimalFarm Microwave Users Group" mailto:af@af.afmug.com> >
Sent: Tuesday, January 23, 2024 12:51:39 PM
Subject: [AFMUG] optical TX power levels

I got 2x 100gb 80km optics from FS that run difficult default TX power levels 
one is 3.81dBm and the other 2.63dBm, the config on the arista devices hosting 
the optics is the same.

 

Has anyone seen much difference between optic like this? My sample size is 
small due to the optices costing $4k each

 

-- 

Zach Underwood (RHCE,RHCSA,RHCT,UACA)

My website  

advance-networking.com  


-- 
AF mailing list
AF@af.afmug.com  
http://af.afmug.com/mailman/listinfo/af_af.afmug.com

 

-- 
AF mailing list
AF@af.afmug.com  
http://af.afmug.com/mailman/listinfo/af_af.afmug.com

-- 
AF mailing list
AF@af.afmug.com  
http://af.afmug.com/mailman/listinfo/af_af.afmug.com

-- 
AF mailing list
AF@af.afmug.com  
http://af.afmug.com/mailman/listinfo/af_af.afmug.com




 

-- 

Zach Underwood (RHCE,RHCSA,RHCT,UACA)

My website  

advance-networking.com  

-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com

Re: [AFMUG] optical TX power levels

[dmmoffett]

They auto adjust the Tx.  I haven’t dug deep into how that works, but I would 
assume it’s keyed off the Rx signals.  

However they do it, it’s not unusual for them to land at different levels

 

This is from a pair of 20km transceivers between two Aristas.  They’re not 
FS.com.  The brand is Precision Optical Technologies, and the OEM is usually 
either Finisar or JDSU depending on the model.

 

   Bias  Optical   Optical

  Temp   Voltage   Current   Tx Power  Rx Power   

Port  (Celsius)  (Volts)   (mA)  (dBm) (dBm) Last Update  

Et27/1 34.73  3.27  62.511.79  -5.14 0:00:01 ago

 

 

   Bias  Optical   Optical

  Temp   Voltage   Current   Tx Power  Rx Power   

Port  (Celsius)  (Volts)   (mA)  (dBm) (dBm) Last Update  

Et31/1 35.07  3.29  67.65-0.69 -1.96 0:00:01 ago

 

 

From: AF  On Behalf Of Zach Underwood
Sent: Tuesday, January 23, 2024 1:52 PM
To: AnimalFarm Microwave Users Group 
Subject: [AFMUG] optical TX power levels

 

I got 2x 100gb 80km optics from FS that run difficult default TX power levels 
one is 3.81dBm and the other 2.63dBm, the config on the arista devices hosting 
the optics is the same.

 

Has anyone seen much difference between optic like this? My sample size is 
small due to the optices costing $4k each

 

-- 

Zach Underwood (RHCE,RHCSA,RHCT,UACA)

My website  

advance-networking.com  

-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com

Re: [AFMUG] optical TX power levels

[Zach Underwood]

TX Power   2~6.5dBm

I am struggling to get this 100gb link up. In the field this link is quoted
at 31 miles. The rx levels are -22 and -20 on both sides but I can't get it
to link. I take the same optics to the lab and add 20dbm of attenuator to
get almost the same rx levels as the field and it will link up.

I have added error-correction encoding reed-solomon per the user guide for
links over 40km.

So far I have not found a way to change the TX levels in arista, the
options are in the CLI but they dont seem to change the outcome. For me
this is the first time dealing with 80km optics or 100gb optics over 10km.

switch is Arista DCS-7060SX2-48YC6-R

https://resource.fs.com/mall/doc/20230531114903y4ljxw.pdf
https://www.fs.com/products/115818.html?attribute=29032&id=3462585

On Wed, Jan 24, 2024 at 8:35 AM Colin Stanners  wrote:

> There should be. What does their datasheey indicate for tx power range?
>
> On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood 
> wrote:
>
>> Yep labels identical but there is a difference in default power levels.
>>
>> On Wed, Jan 24, 2024, 8:13 AM Mike Hammett  wrote:
>>
>>> Oh, meaning the variance between the two, otherwise identical models?
>>>
>>>
>>>
>>> -
>>> Mike Hammett
>>> Intelligent Computing Solutions 
>>> 
>>> 
>>> 
>>> 
>>> Midwest Internet Exchange 
>>> 
>>> 
>>> 
>>> The Brothers WISP 
>>> 
>>>
>>>
>>> 
>>> --
>>> *From: *"Zach Underwood" 
>>> *To: *"AnimalFarm Microwave Users Group" 
>>> *Sent: *Tuesday, January 23, 2024 12:51:39 PM
>>> *Subject: *[AFMUG] optical TX power levels
>>>
>>> I got 2x 100gb 80km optics from FS that run difficult default TX power
>>> levels one is 3.81dBm and the other 2.63dBm, the config on the arista
>>> devices hosting the optics is the same.
>>>
>>> Has anyone seen much difference between optic like this? My sample size
>>> is small due to the optices costing $4k each
>>>
>>> --
>>> Zach Underwood (RHCE,RHCSA,RHCT,UACA)
>>> My website 
>>> advance-networking.com
>>>
>>> --
>>> AF mailing list
>>> AF@af.afmug.com
>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>>
>>> --
>>> AF mailing list
>>> AF@af.afmug.com
>>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>>
>> --
>> AF mailing list
>> AF@af.afmug.com
>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>


-- 
Zach Underwood (RHCE,RHCSA,RHCT,UACA)
My website 
advance-networking.com
-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com

Re: [AFMUG] optical TX power levels

[Colin Stanners]

There should be. What does their datasheey indicate for tx power range?

On Wed, Jan 24, 2024, 7:31 a.m. Zach Underwood  wrote:

> Yep labels identical but there is a difference in default power levels.
>
> On Wed, Jan 24, 2024, 8:13 AM Mike Hammett  wrote:
>
>> Oh, meaning the variance between the two, otherwise identical models?
>>
>>
>>
>> -
>> Mike Hammett
>> Intelligent Computing Solutions 
>> 
>> 
>> 
>> 
>> Midwest Internet Exchange 
>> 
>> 
>> 
>> The Brothers WISP 
>> 
>>
>>
>> 
>> --
>> *From: *"Zach Underwood" 
>> *To: *"AnimalFarm Microwave Users Group" 
>> *Sent: *Tuesday, January 23, 2024 12:51:39 PM
>> *Subject: *[AFMUG] optical TX power levels
>>
>> I got 2x 100gb 80km optics from FS that run difficult default TX power
>> levels one is 3.81dBm and the other 2.63dBm, the config on the arista
>> devices hosting the optics is the same.
>>
>> Has anyone seen much difference between optic like this? My sample size
>> is small due to the optices costing $4k each
>>
>> --
>> Zach Underwood (RHCE,RHCSA,RHCT,UACA)
>> My website 
>> advance-networking.com
>>
>> --
>> AF mailing list
>> AF@af.afmug.com
>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>
>> --
>> AF mailing list
>> AF@af.afmug.com
>> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com

Re: [AFMUG] optical TX power levels

[Zach Underwood]

Yep labels identical but there is a difference in default power levels.

On Wed, Jan 24, 2024, 8:13 AM Mike Hammett  wrote:

> Oh, meaning the variance between the two, otherwise identical models?
>
>
>
> -
> Mike Hammett
> Intelligent Computing Solutions 
> 
> 
> 
> 
> Midwest Internet Exchange 
> 
> 
> 
> The Brothers WISP 
> 
>
>
> 
> --
> *From: *"Zach Underwood" 
> *To: *"AnimalFarm Microwave Users Group" 
> *Sent: *Tuesday, January 23, 2024 12:51:39 PM
> *Subject: *[AFMUG] optical TX power levels
>
> I got 2x 100gb 80km optics from FS that run difficult default TX power
> levels one is 3.81dBm and the other 2.63dBm, the config on the arista
> devices hosting the optics is the same.
>
> Has anyone seen much difference between optic like this? My sample size is
> small due to the optices costing $4k each
>
> --
> Zach Underwood (RHCE,RHCSA,RHCT,UACA)
> My website 
> advance-networking.com
>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com

Re: [AFMUG] optical TX power levels

[Colin Stanners]

Many SFPs say up to 5dB variance in their specs, but luckily I've only
experienced up to 2-3dB. 1.2dB variance is small.


On Wed, Jan 24, 2024, 7:13 a.m. Mike Hammett  wrote:

> Oh, meaning the variance between the two, otherwise identical models?
>
>
>
> -
> Mike Hammett
> Intelligent Computing Solutions 
> 
> 
> 
> 
> Midwest Internet Exchange 
> 
> 
> 
> The Brothers WISP 
> 
>
>
> 
> --
> *From: *"Zach Underwood" 
> *To: *"AnimalFarm Microwave Users Group" 
> *Sent: *Tuesday, January 23, 2024 12:51:39 PM
> *Subject: *[AFMUG] optical TX power levels
>
> I got 2x 100gb 80km optics from FS that run difficult default TX power
> levels one is 3.81dBm and the other 2.63dBm, the config on the arista
> devices hosting the optics is the same.
>
> Has anyone seen much difference between optic like this? My sample size is
> small due to the optices costing $4k each
>
> --
> Zach Underwood (RHCE,RHCSA,RHCT,UACA)
> My website 
> advance-networking.com
>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
> --
> AF mailing list
> AF@af.afmug.com
> http://af.afmug.com/mailman/listinfo/af_af.afmug.com
>
-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com

Re: [AFMUG] optical TX power levels

[Mike Hammett]

Oh, meaning the variance between the two, otherwise identical models? 




- 
Mike Hammett 
Intelligent Computing Solutions 

Midwest Internet Exchange 

The Brothers WISP 




- Original Message -

From: "Zach Underwood"  
To: "AnimalFarm Microwave Users Group"  
Sent: Tuesday, January 23, 2024 12:51:39 PM 
Subject: [AFMUG] optical TX power levels 


I got 2x 100gb 80km optics from FS that run difficult default TX power levels 
one is 3.81dBm and the other 2.63dBm, the config on the arista devices hosting 
the optics is the same. 


Has anyone seen much difference between optic like this? My sample size is 
small due to the optices costing $4k each 



-- 






Zach Underwood (RHCE,RHCSA,RHCT, UACA ) 


My website 

advance-networking.com 

-- 
AF mailing list 
AF@af.afmug.com 
http://af.afmug.com/mailman/listinfo/af_af.afmug.com 

-- 
AF mailing list
AF@af.afmug.com
http://af.afmug.com/mailman/listinfo/af_af.afmug.com